Portable building



FIG. 1 is a perspective view showing front, top and left side of theportable building of our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The broken lines depict environment and form no part of the claimeddesign.

CLAIM The ornamental design for portable building, as shown anddescribed.